CN108307629A - B columns center sill and manufacturing method - Google Patents

B columns center sill and manufacturing method Download PDF

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Publication number
CN108307629A
CN108307629A CN201680069644.3A CN201680069644A CN108307629A CN 108307629 A CN108307629 A CN 108307629A CN 201680069644 A CN201680069644 A CN 201680069644A CN 108307629 A CN108307629 A CN 108307629A
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China
Prior art keywords
soft zone
columns
center
fastening part
zone
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CN201680069644.3A
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CN108307629B (en
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S·马克斯杜兰
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Autotech Engineering SL
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Autotech Engineering SL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D47/00—Making rigid structural elements or units, e.g. honeycomb structures
    • B21D47/01—Making rigid structural elements or units, e.g. honeycomb structures beams or pillars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/04—Door pillars ; windshield pillars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
    • B62D29/007—Superstructures, understructures, or sub-units thereof, characterised by the material thereof predominantly of special steel or specially treated steel, e.g. stainless steel or locally surface hardened steel
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2221/00—Treating localised areas of an article
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron

Abstract

In a first aspect, a kind of B column center sills being formed from steel, including hard area and soft zone.Such soft zone has mechanical strength more lower than the hard area.The B column center sills further include upper area and lower area, which has the fastening part for being fastened to roof components, and the lower area has the fastening part for being fastened to bottom girder component.The B column center sills include two soft zones.One lower part soft zone is located between 50% and the lower part fastening part of B columns center depth of beam, and a top soft zone is located between 50% and the top fastening part of B columns center depth of beam.The top soft zone has mechanical strength more higher than the lower part soft zone.Additionally provide the method for manufacturing such B column center sills.

Description

B columns center sill and manufacturing method
Technical field
This application involves and require to enjoy in the equity and priority of the EP15382640.9 submitted on December 18th, 2015. This disclosure relates to B columns, more particularly to the B column center sills with soft zone.
Background technology
Vehicle (for example, automobile) includes to be designed to bear the knot for all load that vehicle can suffer from during its service life Structure skeleton.The structural framework is also devised to bear and absorb shock, the case where being collided with such as other automobiles or barrier Under.
In this sense, the structural framework of vehicle (for example, automobile) may include such as bumper, column (A columns, B columns, C Column), side collision prevention girders, side girders (rocker panel) and damper.For the structural framework of automobile, or at least for many Its component has become customary, the unimach in the automotive industry using so-called unimach (UHSS) Show the optimization maximum intensity of per unit weight and advantageous formability performance.UHSS can have at least 1000MPa, excellent The tensile strength of selection of land about 1500MPa or up to 2000MPa or bigger.
One embodiment of the steel used in the automotive industry is 22MnB5 steel.Hereafter outline by weight percentage The component of 22MnB5 (remaining is iron (Fe) and impurity)：
Several 22MnB5 steel with similar chemical constituent are commercially available.However, each ingredient of 22MnB5 steel is definite Amount may be slightly changed from a manufacturer to another manufacturer.In other embodiments, 22MnB5 can contain about The Cr of 0.23% C, 0.22% Si and 0.16%.The material can also include Mn, Al, Ti, B, N, Ni in varing proportions.
Available commercially from Arcelor Mittal's1500P be welding blank and splicing blank in use it is commercially available Steel one embodiment.Welding (welding) blank and splicing blank provide before deformation technique (for example, drop stamping) to be had The blank of variable thickness or individual material properties.Thickness change in welding blank should not be obscured with (part) reinforcement.At this In a meaning, reinforcement is alternatively added to component after deformation technique.
1500P is supplied with ferrite-pearlite phase (ferritic-perlitic phase).It is with The fine grained structure of homogeneity pattern distribution.Mechanical performance is related with this structure.Heating, drop stamping technique and subsequent quenching it Afterwards, martensite microstructure is created.As a result, ultimate tensile strength and yield strength obviously increase.
Hereafter outline by weight percentageComponent (remaining is iron (Fe) and inevitable miscellaneous Matter)：
C Si Mn P S Cr Ti B N
0.24 0.27 1.14 0.015 0.001 0.17 0.036 0.003 0.004
The steel of any of these components (is usually 22MnB5 steel, is such as especially) it can be supplied with coating, To prevent corrosion and oxidation damage.This coating can be such as aluminium-silicon (AlSi) coating or the main painting including zinc or kirsite Layer.
After drop stamping and then quenchingThe ultimate elongation of (that is, with martensitic microstructure) is strong Degree is 1.550MPa ± 150, and yield strength is about 1.150MPa ± 150.
In B columns, a major issue is to ensure that the deformation for the very little that do not deform or occur in intermediate region, because invading Entering may make vehicle occupant be hurt.A solution is to make B columns area with different thickness.Specifically, central area is (about For the half of the height of B columns) can be more solid (i.e. thicker), to avoid above-mentioned intrusion, but thus total weight increases.
Another solution is welding reinforcement, such as by spot welding, to strengthen the structure.Such reinforcement is usual It is formed from steel, and even if the material is hard not as good as the material of B columns, but obtained structure passes through additional material after combination Material is strengthened.However, the use of reinforcement is directed to weight increase, because additional material is added to the structure.
It keeps the weight of each component in the structural framework to be in Guaranteed to be important, because motor corporation attempts Weight saving is set to maximize, because heavier vehicle is directed not only to higher manufacturing cost, and is related to increased fuel consumption, Due to the high inertia of big quality, the difficulty bigger when acceleration, braking and/or steering.
The ductility and energy absorption in key area (for example, low portion of B columns) in order to improve component, it is known that It is that softer region is introduced in identical component.Soft zone can locally improve ductility, while maintain required totality High intensity.In addition, the deformational movement under shock or collision situation can suitably be customized by including such soft zone.
The known method that the region (soft zone) with increased ductility is created in vehicle structural members includes providing to contain There are the tool of the upper die unit and lower mould unit of a pair of of complementation, each of described unit that there is discrete mold member Part (bloom).The mould element is designed to work at different temperature, to be just formed during quenching technical There is different cooling rates, to generate different material properties in final products (soft zone) in partial different areas. Such method is referred to as controlled cooling (in-die controlled cooling) technique in mold.
Mentioned soft zone (for example, being placed on the soft zone in the low portion of B columns) cannot resist big load, and the column can It can be deformed, which may lead to the intrusion of the central area to B columns.
In short, needing the mechanical behavior of optimization/improvement B columns in collision accident, while mitigating same column as much as possible Weight.
Invention content
In a first aspect, providing a kind of B column center sills being formed from steel, the B columns center sill includes：Hard area and soft Area, the soft zone have yield strength more lower than the hard area and/or tensile strength；Upper area and lower area, it is described There is upper area the fastening part for being fastened to roof components, the lower area to have for being fastened to bottom girder (sill) The fastening part of component.The B columns center sill includes two soft zones.One lower part soft zone is created in B columns center depth of beam Between 50% and the lower part fastening part, and a top soft zone be created in B columns center depth of beam 50% and it is described on Between portion's fastening part.The top soft zone has yield strength more higher than the lower part soft zone and/or tensile strength.It is described Top fastening part and the lower part fastening part are mainly hard area.
Using two soft zones, (one is located in the top half of the center sill, and another is located at the center sill In lower half portion) it can be to avoid the intrusion of the central area (being located between the 30% and 70% of height) to the B columns center sill. Two soft zones combine the combination of remaining hard area (that is, center fastener part, top fastening part and lower part fastening part) to make B Column can be generally straight it is inwardly displaced, rather than using single lower part soft zone in the case of slope inwardly displacement.This can be with Reduce the injury caused by vehicle occupant.
And for lower part soft zone, an important requirement is to absorb energy, and for top soft zone, deformation triggering is more attached most importance to It wants.Therefore, top soft zone can have higher mechanical strength.Higher mechanical strength is it is meant that give identical material weight Amount, can bear higher load.Therefore, the weight of B columns can be by making top soft zone with higher level or intensity come excellent Change.
In this respect, the higher mechanical strength of top soft zone, which is considered top soft zone, has surrender more higher than lower part soft zone Intensity and/or higher ultimate tensile strength.However, the yield strength and/or ultimate tensile strength of top soft zone still are below B The respective intensities of the remainder (that is, " hard area " with martensitic microstructure) of column.
Herein, " hard area " should be understood such region of the B columns center sill：Mainly have martensite microcosmic The ultimate tensile strength of structure and about 1.400MPa or bigger.
" soft zone " should be understood such region of the B columns center sill：In such region, steel has than hard area Less martensitic microstructure and about 1.050MPa or smaller ultimate tensile strength.Depending on grade, soft zone it is microcosmic Structure can be the combination of such as bainite and martensite, bainite, martensite and ferritic combination or ferrite and pearly-lustre The combination of body.
It uses " soft zone " and " hard area ", the thickness of the B columns center sill can be kept constant or generally along its height It is constant.The use of welding welding blank or splicing rolling blank can be avoided or reduced.
In some embodiments, the lower part soft zone is located between the 3%-50% of B columns center depth of beam, is preferably located in Between the 3%-25% of B columns center depth of beam.Such position allows energy dissipation, and at away from safety of vehicle passengers distance Deformation.In B columns by the part being attached at bottom girder component (or " side bar ") in this regard in be maintained it is strong with high machinery Degree.At height between the 3%-25% of the height of B columns, center B columns usually have increased width.In the region soft Allow high-energy absorption in area.
According to another embodiment, the top soft zone is located between the 80%-95% of B columns center depth of beam, preferably status Between the 85%-95% of B columns center depth of beam.It has been found that position of the top soft zone within the scope of these is advantageous, because Obtained B-pillar deformation to reduce the intrusion towards passenger as much as possible.
In some embodiments, the lower part soft zone can be with the yield strength between 400MPa-700MPa.And one In a little embodiments, the top soft zone can be with the yield strength between 550MPa-800MPa.
In some embodiments, the lower part soft zone can have 10mm-300mm, preferably 30mm-300mm, more preferably The height of ground 30mm-200mm.And in some embodiments, the top soft zone can have 10mm-150mm, preferably The height of 10mm-100mm, more preferably 30mm-100mm.
In some embodiments, B columns, which include the part of the top soft zone, has essentially u-shaped cross section, wherein institute U-shaped tool is stated there are one bottom wall and two side walls, and the at one end of each side wall in the side wall outwardly projecting cross To flange.In some embodiments, the top soft zone includes at least part of the side wall and the bottom wall.
In some embodiments, the top soft zone may include the bottom wall and generally complete side wall.At some In embodiment, the top soft zone may include one or more lateral flanges.
In some embodiments, the B columns center sill has less constant thickness.
In second aspect, a method of for manufacturing B column center sills.First, being formed has a height, lower part fastening part Divide the B column center sills with top fastening part.Then, it is created according to implementation disclosed herein in the B columns center sill Any one lower part soft zone and top soft zone in example, and the wherein described top fastening part and the lower part fastening part are main For hard area.
In some embodiments, the lower part soft zone, including drop stamping can be created during forming the B columns center sill With controlled cooling in mold.It in alternative embodiments, can be after forming the B columns center sill by drop stamping, by adding Heat creates the lower part soft zone.
It in some embodiments, can be after forming the B columns center sill by drop stamping, by heating to create State top soft zone.
Description of the drawings
The non-limiting embodiment of present disclosure is described below with reference to the accompanying drawings, wherein：
Fig. 1 instantiates common B column center sills；
Fig. 2 a and Fig. 2 b instantiate tool, and there are two the embodiments of the B column center sills of soft zone；
Fig. 3 instantiates the B column center sills of the soft zone with the entire width for not covering B columns；
The U-shaped that Fig. 4 a- Fig. 4 d instantiate the part with different configuration of soft zone in the B columns according to multiple embodiments is transversal Face；
Fig. 5 a and Fig. 5 b instantiate B column center sills according to one embodiment, being included in before and after collision accident Transverse views；And
Fig. 6 instantiates the transverse views of B column center sills arrange according to prior art, before collision accident.
Specific implementation mode
Fig. 1 depicts B columns center sill 100, and usual B columns center sill 100 is welded to side bar at lower part fastening part 105 (rocker), and in top fastening part 101 it is welded to the roof panel of vehicle (such as automobile).Before B columns are located at vehicle Between seat and back seat, and it is also useful for different purposes.Described in as before, it gives the skeleton structure of vehicle Support is given, and safety curtain is provided in vehicle collision.
In some embodiments, B columns may include center sill, external plates and inner panel, and optionally include another center Reinforcement (center is here and hereinafter meant that between the external plates and the inner panel).The inner panel can be used for multiple portions It is internal to be attached to vehicle (for example, automobile).The external plates can be particularly used for providing complementary shape for car door.According to specific Embodiment, both inner panel and external plates can contribute to the structural strength and flintiness of obtained B columns.
In addition, B column center sills be also used as many elements be tethered at portion (mooring), the portion of being tethered at is used for anchor It is scheduled in the hole set by respective purpose.The B columns center sill 100 of Fig. 1 may include for installing seat harness One hole of anchor and another hole for placing door lock.B columns center sill can also have the fastener hole of different shape and size, Such as to be attached the decorative plastic or lining of interior vehicle structure.Fig. 1 further depicts outwardly projecting flange 106.
B columns center sill 100 is located at the central area 103 between the 30% and 70% of the height of B columns and is collided in lateral direction of car In play an important role.Shock may cause to the intrusion in structure, which may bring danger to vehicle occupant.Therefore, weight What is wanted is, it is ensured that does not deform in such central area 103.
Fig. 2 a and Fig. 2 b depict the difference of the B column center sills including top soft zone 210,220 and lower part soft zone 211,221 Embodiment.Soft zone is (steel blank) region, and for the region, microstructure has been customized to change mechanical performance, from And increase the ductility in the region.The following outlines the characteristics of the different embodiments in possible customization region：
HT 400, HT 500, HT 700, HT 800 be byThe different grades of steel being commercially available.
Can have different grade or yield strength according to the soft zone of multiple embodiments of present disclosure, to control B Deformation in column center sill.The grade of top soft zone can be higher than the grade of lower part soft zone.The following outlines for top soft zone The different embodiments combined with the possibility grade of lower part soft zone：
Lower part soft zone yield strength (MPa) Top soft zone yield strength (MPa)
400±50 550±50
400±50 700±50
400±50 800±50
550±50 700±50
550±50 800±50
700±50 800±50
According to multiple embodiments of present disclosure, two soft zones being already mentioned above can have different height.Lower part Soft zone can be with the height between 10mm-300mm, the height between preferably 30mm-200mm, and more preferably 30mm- Height between 200mm.On the other hand, top soft zone can be with the height between 10mm-150mm, preferably 10mm- Height between 100mm, and the height between more preferably 30mm-100mm.The main purpose of top soft zone is not energy consumption It dissipates, therefore, it may not be wide as the soft zone of lower part/high.
Fig. 2 a depict a reality of the front view of the B columns center sill 200 with top soft zone 210 and lower part soft zone 211 Example is applied, which there is the yield strength of 550MPa, the lower part soft zone to be significantly wider than top soft zone 210 (in other words：It should Lower part soft zone has increased height), which has the yield strength of 400MPa.
In figure 2b, the front view of 200 center sill of B columns with top soft zone 220 and lower part soft zone 221 is shown, it should Top soft zone 220 has the height than 210 bigger of soft zone shown in Fig. 2 a.In the embodiment of Fig. 2 b, yield strength is different In the embodiment of Fig. 2 a, top soft zone 221 has the yield strength of 800MPa, and surrender of the lower part soft zone with 700MPa is strong Degree.
The soft zone referred in this way can be created in the different zones of B column center sills.Lower part soft zone can be created in B Between 50% and lower part fastening part of column center depth of beam, it is created between the 3%-50% of B columns center depth of beam, it is more excellent Selection of land is created between the 3%-25% of B columns center depth of beam.Top soft zone can be created in B columns center depth of beam Between 50% and top fastening part, it is created between the 80%-95% of B columns center depth of beam, is preferably created in B columns Between the 85%-95% of center depth of beam.
It can be by different technologies (such as, controlled cooling or laser heat in the mold after deformation technique) in steel Soft zone is created in blank.
It can be during drop stamping technique, by controlled cooling in mold, especially when soft zone has sizable surface When, form the soft zone of the embodiment according to present disclosure.Mold used in (heat) deformation technique may include it is many not Same mold block.In order to create soft zone, the temperature of such mold mold block in the block can be controlled as being different from another The temperature of one mold block.When creating soft zone during thermal deformation technique, soft zone can preferably at least correspond to such mold The surface of block.Therefore, the lower limit of at least height of 30mm can be had by being formed by soft zone by this method.
It can be heated using such as laser after Sheet Metal Forming Technology (for example, cold stamping or drop stamping) to create according to another The soft zone of one embodiment.Laser heating process heats workpiece (for example, metal stock) using laser beam, to change the workpiece Microstructure, to change the mechanical performance of the workpiece.
Laser heating technique needs the minimum widith of 10mm.Laser heating can also be used to create the region of bigger, but It may relate to high time loss.Therefore, laser heating focuses more on the establishment of small soft zone.
It according to yet another embodiment, can be in the establishment of each soft zone using different and according to the width of each soft zone Technology.Soft zone (for example, lower part soft zone) can be created by controlled cooling in mold, once and steel blank (for example, in B columns Heart beam) it is manufactured, laser heating technique or such as sensing heating can be used to create one (at least) soft zone (for example, top Soft zone).
Fig. 3 shows tool, and there are two the front views of the B column center sills of soft zone 310,311.Lower part soft zone 311 covers in B columns The entire width of heart beam, and top soft zone 310 only covers a part for the width of B column center sills.
Fig. 4 a- Fig. 4 d schematically depict the one of B columns according to multiple embodiments of present disclosure, with soft zone The different embodiments of partial cross section.Such soft zone can be preferred that top soft zone.
Fig. 4 a show soft zone 410, which covers the entire U-shaped cross-section of a part of B column center sills and convex Edge.Fig. 4 b show a cross section, and wherein soft zone 420 includes the bottom wall of U-shaped and generally complete side wall.Fig. 4 c are depicted The cross section of soft zone 430, the soft zone 430 include a part and bottom wall for the side wall of U-shaped.Fig. 4 d depict the transversal of soft zone 440 Face, the soft zone 440 include two lateral flanges.
In these embodiments, the main target of top soft zone be influence deformational movement, rather than under collision situation into Row local energy absorbs.It has been found that in order to make deflection steer, make a soft zone only in the width of the partial cross-section of B columns Extend in a part and is sufficient.Therefore, the overall strength of B columns in these cases can be higher than soft zone in entire part width The case where upper extension.
In in these embodiments some, soft zone can be about the longitudinal axis general symmetry of B columns.In some implementations In example, soft zone can be split into two discrete parts (mainly in lateral flange).
Fig. 5 a are schematically depicted to be regarded according to transverse direction of the B columns center sill 500 of one embodiment before collision accident Figure.B columns center sill 500 includes a central area 511 and two soft zones 510,512.Top soft zone 510 improves the movement of structure Scholarship and moral conduct is, and lower part soft zone 512 realizes energy dissipation.
Figure 5b shows that the transverse views according to the B columns center sill 500 of one embodiment after collision accident.In transverse direction After collision, due to energy dissipation, primary deformable is located at lower part soft zone 522, and top soft zone 520 has been subjected to small deformation. Therefore, without generation intrusion or deformation in the central area 521 of B columns center sill 500, or few intrusion or deformation occurs.
Fig. 6 shows the B columns center sill 600 being arranged according to the prior art only with lower part soft zone after collision accident Transverse views.With Fig. 5 b (wherein B columns central area keeps not invading) on the contrary, the B columns center sill 600 of Fig. 6 is in its center By intrusion 610 in region.This is because " hinge " of deformation is served as in the inclination of the low portion of B column center sills, wherein soft zone.
In this sense, in figure 5b it can be appreciated that provided with " hinge " as two, and the center of the beam Part keeps straight.
Although only disclosing several embodiments herein, other of these embodiments are substituted, modification, purposes and/or are waited Jljl is also possible.In addition, all possible combination of described embodiment is also capped.Therefore, present disclosure Range should not be limited by specific embodiment, and should only be determined by correctly understanding appended claims.

Claims (16)

1. a kind of B column center sills being formed from steel, including：
Hard area and soft zone, wherein the soft zone has yield strength more lower than the hard area and/or tensile strength,
Upper area and lower area, the upper area have the top fastening part for being fastened to roof components, and institute Lower area is stated with the lower part fastening part for being fastened to bottom girder component, and includes
Lower part soft zone is located between 50% and the lower part fastening part of B columns center depth of beam, and
Top soft zone is located between 50% and the top fastening part of B columns center depth of beam, wherein
The top soft zone has yield strength more higher than the lower part soft zone and/or tensile strength, and the wherein described top Fastening part and the lower part fastening part are mainly hard area.
2. B columns center sill according to claim 1, wherein the lower part soft zone is with bending between 400MPa-700MPa Take intensity.
3. the B column center sills according to any one of claim 1-2, wherein the top soft zone has 550MPa- Yield strength between 800MPa.
4. the B column center sills according to any one of claim 1-3, wherein the lower part soft zone is located in the B columns Between the 3%-50% of heart depth of beam, it is preferably located between the 3%-25% of B columns center depth of beam.
5. the B column center sills according to any one of claim 1-4, wherein the top soft zone is located in the B columns Between the 80%-95% of heart depth of beam, it is preferably located between the 85%-95% of B columns center depth of beam.
6. the B column center sills according to any one of claim 1-5, wherein the lower part soft zone has 10mm-300mm Height, the preferably height of 30mm-300mm, the more preferably height of 30mm-200mm.
7. the B column center sills according to any one of claim 1-6, wherein the top soft zone has 10mm-150mm Height, the preferably height of 10mm-100mm, the more preferably height of 30mm-100mm.
8. the B column center sills according to any one of claim 1-7, wherein B columns include the one of the top soft zone Part has essentially u-shaped cross section, wherein there are one bottom wall and two side walls for U-shaped tool, and in the side wall Each side wall the outwardly projecting lateral flange of at one end.
9. B columns center sill according to claim 8, wherein the top soft zone include the side wall at least part and The bottom wall.
10. B columns center sill according to claim 9, wherein the top soft zone includes the bottom wall and generally complete Side wall.
11. the B column center sills according to any one of claim 8-10, wherein the top soft zone includes one or more A lateral flange.
12. the B column center sills according to any one of claim 1-11 have less constant thickness.
13. the method for manufacturing B column center sills, the method includes：
Being formed has a height, the B column center sills of lower part fastening part and top fastening part,
Lower part soft zone is created between 50% and the lower part fastening part of B columns center depth of beam,
Top soft zone is created between 50% and the top fastening part of B columns center depth of beam, wherein
The top soft zone has mechanical strength more higher than the lower part soft zone, and the wherein described top fastening part and described Lower part fastening part is mainly hard area.
14. according to the method for claim 13, wherein creating the lower part soft zone during forming the B columns center sill, Including controlled cooling in drop stamping and mold.
15. according to the method for claim 13, wherein after forming the B columns center sill by drop stamping, by adding Heat creates the lower part soft zone.
16. according to the method described in any one of claim 13-15, wherein forming B columns center by drop stamping After beam, the top soft zone is created by heating.
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